LYCOS RETRIEVER 
Antibiotics: Diseases
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Unfortunately, these good flora are so vulnerable to antibiotics that, in mice, a "single injection of streptomycin can eradicate the protective effect of the normal flora. (Mandell. Principles and Practice of Infectious Diseases. 2000.)" And, once gone, these friendly bacteria are replaced by hostile bacteria such as Pseudomonas, Clostridium, and Klebsiella, and by Candida yeast, a powerful member of the fungi family.
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UCS urges the Food and Drug Administration (FDA) to ban or severelylimit the use of antibiotics for nontherapeutic purposes such as growth promotion or disease prevention. UCS closely follows actions by the FDA and other government agencies, providing scientific and citizen comments and feedback on regulatory rulemaking procedures.
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[S]ome strains of Staphylococcus aureus, that may cause pneumonia or bloodstream infections,are resistant to almost all antibiotics, making those conditions very difficult to treat. Many strains of tuberculosis... an infectious disease, alsoare now resistant to one or more of the agents used to control tuberculosis.
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Modern industrial livestock operations are an example of how rampant overuse of antibiotics threatens to increase the prevalence of antibiotic-resistant bacteria. These industrial farms have been mixing antibiotics into livestock feed since 1946, when various studies showed that low levels of antibiotics (too low to actually fight disease) seemed to help animals grow faster and put on weight more efficiently... increasing profits for meat producers.iv When antibiotics are used like this - for purposes other than treating an illness - it is called non-therapeutic use.
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